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GTAW weld area. Manual gas tungsten arc welding is a relatively difficult welding method, due to the coordination required by the welder. Similar to torch welding, GTAW normally requires two hands, since most applications require that the welder manually feed a filler metal into the weld area with one hand while manipulating the welding torch in the other.
A transformer-style welding power supply converts the moderate voltage and moderate current electricity from the utility mains (typically 230 or 115 VAC) into a high current and low voltage supply, typically between 17 and 45 (open-circuit) volts and 55 to 590 amperes. A rectifier converts the AC into DC on more expensive machines.
Arc welding power supplies can deliver either direct (DC) or alternating (AC) current to the work, while consumable or non-consumable electrodes are used. The welding area is usually protected by some type of shielding gas (e.g. an inert gas), vapor, or slag. Arc welding processes may be manual, semi-automatic, or fully automated.
Kemppi Oy is a Finnish company, founded in 1949 by Martti Kemppi [].The company is a manufacturer of welding equipment. It is located in Lahti city. The company has subsidiaries in 13 countries, sales offices and retailers in over 70, and its turnover is more than €90 million.
Miller Electric is an American arc welding and cutting equipment manufacturing company based in Appleton, Wisconsin.Miller Electric, has grown from a one-man operation selling products in northeastern Wisconsin to what is today one of the world's largest manufacturers of arc welding and cutting equipment.
Resistance welding – Power supplies (linear DC, high and mid frequency inverters, capacitive discharge, AC weld controls), weld monitors and checkers, displacement monitors, weld heads (manual and air actuated, servo-motor controlled, electromagnetic), accessories and consumables.
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